de moivre - give as reason? (1 Viewer)

[spaz1810]

if i say that (rcis@)^n = r^ncisn@ do i have to put (de moivre) after it like when giving reasons in geometry? i never have but when i saw worked answers to past hsc papers they have

 

[BillyMak]

It can't hurt to do so, although I doubt you would ever lose a mark for not doing it.

I would usually do something like:

(rcis@)^n = (r^n)cisn@ (From De Moivre's theorem) etc.

 

[Supra]

i wud put it in brackets...thers no harm in doing it, but i cant c em takin marks off ya for not

 

[tina_goes_doo]

Yeah i went to two different maths tutors and they both put down "(De Moivre's Theorem)" on the RHS. This was also the case for answering a question on the complex roots of unity. So i'm guessing they would like to see you write it, but probably wont be harsh enough to mark you down.

 

[townie]

my teacher always did it, and most of the answers i've seen include it. i'd agree it wouldnt hurt to put it in, but it would hardly loose a mark i wouldnt have thought

 

[xiao1985]

just write by D.M.T.... that woudl suffice